I don't believe there's any documentation. However, loading the program puts an icon in the taskbar, which is (for the most part) self-evidently configurable. You get a choice of fonts, point size, margins, lines per page, font translation (code 437), choice of
installed printers, and provision for supplying the file name and directory of the file which winprint will monitor (you must print to file with this utility), and printer selection. Winprint is the fastest option available I've found; a xywrite tyf command goes instantly to the printer. By contrast, it's several seconds before vDos's dosprinter utility kicks in with a dialogue box.